eoc chemistry

VIRGINIA STANDARDS OF LEARNING

Spring 2009 Released Test

END OF COURSECHEMISTRY

Form S0119, CORE 1

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©2009 by the Commonwealth of Virginia, Department of Education, P.O. Box 2120, Richmond, Virginia 23218-2120. All rights reserved. Except as permitted by law, this material may not be reproduced or used in any form or by any means, electronic or mechanical, including photocopying or recording, or by any information storage or retrieval system, without written permission from the copyright owner. Commonwealth of Virginia public school educators may reproduce any portion of these released tests for non-commercial educational purposes without requesting permission. All others should direct their written requests to the Virginia Department of Education, Division of Student Assessment and School Improvement, at the above address or by e-mail to [email protected].

VA516984_Chem Released 3/3/10 9:04 AM

3

Chemistry

Directions

Read each question and choose the best answer.

SAMPLE

Which of the following is a balanced equation?

A

B

C

D 22 2

H Br HBr+ →

H Br HBr2 2

2 2+ →

H Br HBr2 2

+ →

H Br HBr2 2

2+ →


1 Which of these would be best to measure 12.6 mL of liquid ethanol?

A 25 mL beakerB 25 mL volumetric flaskC 25 mL Erlenmeyer flaskD 25 mL graduated cylinder

4

2 Potassium (K) has a smaller atomic mass than argon (Ar) even though theatomic number of potassium is larger than the atomic number of argon.Which of the following best accounts for this observation?

F At STP, potassium is in the solid phase, but argon is a gas.G It is easier for a potassium atom to lose an electron than it is for an argon atom.H The most common isotopes of argon have more protons than the most common

isotopes of potassium.J The most common isotopes of potassium have fewer neutrons than the most

common isotopes of argon.


4 A compound has a mass of The number of significantfigures in this mass is —

F 2G 4H 5J 7

2 6632 102. × g/mol.

3 Which of the following is the correct Lewis electron-dot diagram for thesodium atom?

A

B

C

D Na

Na

Na

Na

5


6

5

What are the coefficients of the correctly balanced equation?

A 1, 3, 2, 3B 0, 2, 2, 3C 1, 2, 2, 2D 2, 6, 4, 3

? Fe O ? CO ? Fe ?2 3

+ → + CO2

6 The correct formula for dinitrogen pentoxide is —

F

G

H

J N O2

NO5

N O5

N O2 5

7 When ionic compounds are named, the name of a monatomic anion will end inwhich of the following suffixes?

A -icB -iteC -ateD -ide


9 What is the name of the compound with the formula

A Phosphorus(I) chlorideB Phosphorus(V) chlorineC Phosphorus pentachlorateD Phosphorus pentachloride

PCl5

?

8 When 1 g of sodium chloride (NaCl) is placed in 100 g of water, a solutionresults. Once the solution is prepared, water is now considered what part ofthe solution?

F SolidG LiquidH SoluteJ Solvent

7

10 How many electrons does the iron ion have when it forms the ionic compound

F 20G 23H 26J 29

FeCl ?3


11 Covalent bonds mainly occur between —

A two nonmetallic elementsB two metallic elementsC one metallic element and one nonmetallic elementD one metalloid and one metallic element

8

12

What is the volume of the water in this graduated cylinder?

F 4.39 mLG 4.41 mLH 4.55 mLJ 5.61 mL

mL10

9

8

7

6

5

4

3

2

1

5

4


14 If a sample has a mass of and a volume of 51 mL, what is its density?

F 0.00025 g/mLG 0.0125 g/mLH 2.5 g/mLJ 250 g/mL

1 25 102. × g

13 If substance X is a liquid, substance Y is a gas, and substance Z is a solid, andall are at the same temperature and pressure, then the order of increasingstrength of their intermolecular forces would be —

A X < Y < ZB Y < X < ZC Z < Y < XD Y < Z < X

9

15 What is the empirical formula of the compound with the molecular formula

A CHBCD C H

2 6

CH4

CH2

C H6 12

?


16

The diagram shows water molecules in an open beaker and water moleculesthat have evaporated into the air above the beaker. Which change in thissystem will increase the rate of evaporation?

F Adding salt to the waterG Increasing the temperature of the waterH Increasing the pressure of the air above the waterJ Increasing the humidity of the air above the water

= Water molecule

10

17 A chemist is examining an unidentified element sample with oxidation states of The element has a shielding effect similar to that ofpotassium (K). Which statement about the unidentified element is mostlikely true?

A It has the same number of neutrons as potassium.B It is a transition metal from the same period as potassium.C It is one of the heaviest elements in potassium’s group.D It is a mix of three unstable isotopes of potassium.

+ + +2 3 6, , and .


19 The product in a balanced reaction is . Which of the following showsthe number of aluminum and oxygen atoms in

A 8 atoms of aluminum and 3 atoms of oxygenB 6 atoms of aluminum and 3 atoms of oxygenC 8 atoms of aluminum and 12 atoms of oxygenD 6 atoms of aluminum and 7 atoms of oxygen

42 3

Al O ?4

2 3Al O

18

The reaction for the decomposition of ammonia can be written asshown. If a student starts with 21.7 g of how many grams of hydrogen

gas will be produced by the reaction?

F 1.28 gG 2.55 gH 3.85 gJ 32.5 g

(H )2

NH ,3

(NH )3

2NH (g) N (g) 3H (g)3 2 2→ +

11


20

According to the pH scale, which substance is slightly acidic?

F Battery acidG Black coffeeH Baking sodaJ Drain cleaner

10 2 3 4 5 6 7 8 9 10 11 12 13 14

Batteryacid

Applejuice

Purewater

Bakingsoda

Householdammonia

Lemonjuice

Blackcoffee

Handsoap

AntacidDrain

cleaner

12

21 Which of these is most likely to form between elements transferring electronsto form oppositely charged particles?

A A metallic bondB A hydrogen bondC A covalent bondD An ionic bond


23 The table shows the specific heat capacity of four substances.

For an equal mass of each substance, which one will require the least amountof heat to raise its temperature from 20°C to 30°C?

A AluminumB GlassC Carbon dioxideD Water

SubstanceHeat Capacity

Aluminum 0.900

0.50

0.843

4.18

Glass

Carbon dioxide

Water

Jg • °C

22 Which of the following is a chemical change?

F Salt is dissolved in water.G Water is boiled on a stove.H Gasoline combusts in an engine.J Copper metal is stretched into a long wire.

13


24 What is the volume occupied by 51.0 g of ammonia gas at STP?

F 0.439 LG 22.8 LH 67.2 LJ 91.9 L

(NH )3

14

25

Which substance will release the greatest amount of heat when 1.00 molis frozen?

A ArgonB BenzeneC MercuryD Water

Molar Heat of Fusion andMelting Point for Selected Substances

Substance

Argon

Benzene

Mercury

Water

–190

5.5

–39

0

1.18

9.87

2.29

6.01

ΔH (kJ/mol)MeltingPoint (°C) fus


27 A mixture of gases with a pressure of 800 mm Hg contains 10% oxygen and90% nitrogen by volume. What is the partial pressure of the oxygen gas inthe mixture?

A 10 mm HgB 80 mm HgC 700 mm HgD 800 mm Hg

26 A student hypothesizes that bromine (Br) has different chemical propertiesfrom krypton (Kr). The periodic table supports this hypothesis by indicating that —

F bromine is a metal while krypton is a nonmetalG one mole of bromine is heavier than one mole of kryptonH bromine and krypton are members of the same familyJ bromine and krypton have different numbers of valence electrons

15


28 Which graph best shows the relationship between the volume of a gas and itstemperature as the gas pressure remains constant?

F

Vo

lum

e (m

L)

Temperature (K)

H

Vo

lum

e (m

L)

Temperature (K)

G

Vo

lum

e (m

L)

Temperature (K)

JV

olu

me

(mL)

Temperature (K)

16

29 One example of an ionic compound is —

ABCD MgCl

2

HBrCO

2

F2


30

A bottle of chemical Q spills on the floor. According to the MSDS, what is theproper response to this accident?

F Letting the chemical evaporate by blowing fans on the spillG Diluting the chemical with water, absorbing the liquid with inert material, and

disposing of it in the trashH Wiping up the chemical using paper towels and disposing of them in the trashJ Absorbing the chemical with inert material and disposing of it in a chemical

waste container

Material Safety Data Sheet

Product IdentificationChemical QHazard IdentificationBaker SAF-T DATATM RatingsHealth: 2 – ModerateFlammability: 3 – SevereReactivity: 1 – SlightContact: 1 – SlightHazard ratings are 0 to 4 (0 = no hazard, 4 = extreme hazard).Lab Protective Equipment: Goggles and shield, lab coatand apron, vent hood, proper gloves, class B extinguisherAccidental Spill Instructions: Ventilate area containing thespill. Absorb the chemical with inert material (vermiculite,sand) and place in proper chemical waste container. Do notplace or pour down the drains.

17


32

What type of reaction is shown?

F PrecipitationG NeutralizationH Single replacementJ Double replacement

Zn(s) HCl(aq) ZnCl (aq) H (g)2 2

+ → +2

31 Le Chatelier’s principle describes what happens to a system in equilibriumwhen a stress occurs. All of the following could shift an equilibrium EXCEPT —

A changing the pressure on the systemB changing the temperature of the systemC changing the identity of the catalystD changing the concentration of one of the components

18


35 Which of the following equations is balanced?

ABCD 2 22Na Cl NaCl+ →

Na Cl NaCl+ →2 22Na Cl NaCl2+ →2

Na Cl NaCl2+ →2 2

19

33 Hydrogen chloride is a covalent compound. Which is a correct Lewis dotstructure for HCl?

A H Cl

B H Cl

C H Cl

D H Cl

34 Which is the best use for a fume hood?

F Storing glasswareG Removing toxic vaporsH Covering volatile compoundsJ Mixing chemicals that release O2


36 The specific heat of aluminum is How much heat is required to

raise the temperature of a 30.0 g block of aluminum from to

F 0.540 JG 1.50 JH 1350 JJ 1670 J

75 0. °C?25 0. °C

0 900. Jg °C

.i

20

37

When an electric current is passed through water, the reaction shown takesplace. If the arrow were pointing in the opposite direction, what type ofreaction would the new reaction represent?

A Single-replacementB Double-replacementC SynthesisD Decomposition

2H O O 2H2 2 2→ +


39

If 1.0 mole of methane reacts with oxygen to produce carbon dioxide andwater, what mass of water is produced?

A 16 gramsB 18 gramsC 36 gramsD 44 grams

CH O CO H O4 2 2 2

2 2+ → +

38

The picture shows a small section of elements from the periodic table. Whichelement has one more proton than element X?

F 1G 2H 3J 4

1 2

4X3

Small Periodic Table Section

21


40 An example of a chemical property is —

F mass of a substance per unit volumeG ability to dissolve in solutionH point where solid becomes liquidJ tendency to undergo oxidation

41 Students want to separate and compare the components of black ink andgreen ink. Which technique is the best for the students to use?

A ChromatographyB DecantingC FiltrationD Evaporation

42 When 80 g of sodium hydroxide, NaOH, are dissolved in enough water tomake 500 mL of solution, the molarity of the solution is —

F 1 MG 2 MH 4 MJ 8 M

22


43 What is the name for the compound

A Calcium sulfateB Calcium sulfideC Calcium sulfur oxideD Calcium sulfur oxygen

CaSO ?4

44 If the pH of a solution is 4, what is the pOH?

F 0G 6H 7J 10

23


45 A student attempts to measure the specific heat capacity of an unknown

liquid through repeated trials. She measures its specific heat capacity, in

as 2.14, 2.11, 2.13, 2.12, and 2.11. The specific heat capacity of the

liquid should be recorded as —

A

B

C

D 2 122. Jg °Ci

2 12. Jg °Ci

2 1. Jg °Ci

2 Jg °Ci

Jg °C

,i

24


47 Which of these best describes the basis on which new scientific ideas areaccepted or rejected?

A Popular supportB Historical supportC Compelling evidenceD Moral and ethical beliefs

46

If the temperature changes from point M to point N, at constant pressure,compound X undergoes —

F one phase changeG two phase changesH three phase changesJ no change in phase

Phase Diagram for Compound X

Temperature (ºC)

Pre

ssu

re (

kP

a)

M N

25


48 Based on its position in the periodic table, the element sulfur would beexpected to have how many valence electrons?

F 4G 6H 8J 16

49 The number of molecules in 48.0 grams of oxygen gas is —

ABCD 1 81 1024. ×

1 20 1024. ×9 03 1023. ×6 02 1023. ×

( )O2

50 A student determined that the density of a sample of tin is 8.00 g/mL, whenthe actual density of tin is 7.28 g/mL. What was the percent error in thestudent’s calculation?

F 0.72%G 9.0%H 9.9%J 91%

26


Test Sequence Number Correct Answer

ReportingCategory Reporting Category Description

1 D 001 Scientific Investigation2 J 002 Atomic Structure and Periodic Relationships3 A 003 Nomenclature, Chemical Formulas, and Reactions4 H 001 Scientific Investigation5 A 003 Nomenclature, Chemical Formulas, and Reactions6 F 003 Nomenclature, Chemical Formulas, and Reactions7 D 003 Nomenclature, Chemical Formulas, and Reactions8 J 004 Molar Relationships9 D 003 Nomenclature, Chemical Formulas, and Reactions

10 G 002 Atomic Structure and Periodic Relationships11 A 003 Nomenclature, Chemical Formulas, and Reactions12 F 001 Scientific Investigation13 B 005 Phases of Matter and Kinetic Molecular Theory14 H 001 Scientific Investigation15 B 003 Nomenclature, Chemical Formulas, and Reactions16 G 005 Phases of Matter and Kinetic Molecular Theory17 B 002 Atomic Structure and Periodic Relationships18 H 004 Molar Relationships19 C 003 Nomenclature, Chemical Formulas, and Reactions20 G 004 Molar Relationships21 D 003 Nomenclature, Chemical Formulas, and Reactions22 H 002 Atomic Structure and Periodic Relationships23 B 005 Phases of Matter and Kinetic Molecular Theory24 H 004 Molar Relationships25 B 005 Phases of Matter and Kinetic Molecular Theory26 J 002 Atomic Structure and Periodic Relationships27 B 005 Phases of Matter and Kinetic Molecular Theory28 F 005 Phases of Matter and Kinetic Molecular Theory29 D 003 Nomenclature, Chemical Formulas, and Reactions30 J 001 Scientific Investigation31 C 003 Nomenclature, Chemical Formulas, and Reactions32 H 003 Nomenclature, Chemical Formulas, and Reactions33 B 003 Nomenclature, Chemical Formulas, and Reactions34 G 001 Scientific Investigation35 D 003 Nomenclature, Chemical Formulas, and Reactions36 H 005 Phases of Matter and Kinetic Molecular Theory37 C 003 Nomenclature, Chemical Formulas, and Reactions38 J 002 Atomic Structure and Periodic Relationships39 C 004 Molar Relationships40 J 002 Atomic Structure and Periodic Relationships41 A 001 Scientific Investigation42 H 004 Molar Relationships43 A 003 Nomenclature, Chemical Formulas, and Reactions44 J 004 Molar Relationships45 C 001 Scientific Investigation46 G 005 Phases of Matter and Kinetic Molecular Theory47 C 001 Scientific Investigation48 G 002 Atomic Structure and Periodic Relationships49 B 004 Molar Relationships50 H 001 Scientific Investigation

Answer Key-EOC015-S0119


If you get this many items

correct:

Then your converted scale

score is:0 0001 1992 2323 2524 2675 2796 2907 2988 3069 31410 32011 32712 33313 33814 34315 34916 35317 35818 36319 36820 37221 37622 38123 38524 38925 39426 39827 40228 40729 41130 41531 42032 42433 42934 43435 43936 44437 44938 45539 46040 46741 47342 48043 48844 49745 50746 51947 53348 55349 58650 600

Chemistry, Core 1


eoc chemistry

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